JP6265766B2 - Stirring apparatus and stirring method - Google Patents

Description

  The present invention relates to an agitation device and an agitation method provided for agitating food materials.

  As a conventional stirring device, for example, there is a stirring device described in Patent Document 1. The structure of this stirrer is that an annular stirrer frame is fixed to the lower end of the slant shaft in the direction of the extension of the shaft center in a slant shaft stirrer inserted obliquely from above the container in a cylindrical container with a hemispherical bottom. The lower part of the frame is placed close to the bottom of the cylindrical container. A plurality of scraping blades are attached to the stirrer frame to scrape the tank wall (hemisphere) on the annular stirrer frame.

  This stirring device can efficiently stir and mix an object to be stirred such as food at a low speed, and is widely used as a heating stirrer for food processing.

  However, there are the following problems.

  When a paste-like material such as miso was mixed and dispersed in the liquid, when the paste had low fluidity (= hard), the dispersion was insufficient (= paste remained).

  When mixing and mixing paste-like materials, powders, etc. in a liquid, the part with little relative motion with the liquid to be stirred in the stirrer / stirring blade The part to be dispersed adheres to the back surface of the stirrer, etc., which is likely to cause rotation with the stirrer, and a part thereof remains without being dispersed and mixed.

  When flour such as wheat flour is dispersed in a liquid, dispersion may be insufficient and lumps may be formed.

  When the object to be stirred is altered by high-speed stirring, or when shape retention of the solid matter contained is required, the number of rotations is limited, and the required mixing may not be obtained.

  For example, when solid particles are dispersed in the liquid and the specific gravity of the solid particles is different from that of the liquid and has sedimentation or levitation, mixing that overcomes buoyancy and sedimentation force is required to keep the tank uniform. However, in the case where the tip speed of the stirrer is limited due to the nature of the particles, it is necessary to increase the mixing force without increasing the rotational speed.

JP 2000-157855 A

  The problem to be solved is that when a paste-like material, powder, or the like is dispersed and mixed with a liquid material, and mixing is required when shape retention of the solid material is required.

The present invention accommodates a fluid to-be-stirred object in order to disperse and mix paste-like materials and powders with respect to a liquid material, and to facilitate mixing when shape retention of a solid material is required. An agitation vessel that is movably supported by an agitation blade that agitates and moves along the inner surface of the agitation vessel, and an agitation shaft that supports the agitation unit and can be driven to switch between normal rotation and reverse rotation. The stirring blade includes a base at one end and a tip in contact with the inner surface of the stirring container at the other end, and the movable support of the stirring blade includes the forward rotation and the holding by the base. The support is swingable in the reverse direction, and the stirring blade receives a flow resistance from the object to be stirred during the forward rotation, and scrapes and slides at an acute angle with respect to the inner surface of the stirring container. The tip of the stirring blade is in contact with the inner surface of the stirring vessel. The stirring blade receives flow resistance from the object to be stirred during the reverse rotation, forms an acute angle with the inner surface of the stirring vessel, and the tip of the stirring blade is separated from the inner surface of the stirring vessel, A passage that forms a gap for flow between the inner surface of the stirring vessel and communicates with the flow gap by gradually reducing the cross-sectional area in the forward direction between the front surface in the reverse direction of the stirring blade and the inner surface of the stirring vessel The configuration in which the passage is formed and maintained includes a loose fitting recess of the stirring blade and a pin of the stirring portion for stopping the separation by engagement, or a certain range of the stirring blade. It is a stopper of the stirring unit that restricts the above swinging by contact, and a part of the stirred object flows out of the flow gap through the passage during the reverse rotation .

  A stirrer container that contains a fluid stirrer or contains a fluid stirrer, a stirrer that supports a stirrer that stirs and moves along the inner surface of the stirrer, and supports the stirrer A stirring method using a stirring device having a stirring shaft that can be driven to switch between normal rotation and reverse rotation with respect to the stirring vessel, wherein the reverse direction of the stirring blade and the inner surface of the stirring vessel during the reverse rotation A cross-sectional area gradually decreases in the forward rotation direction therebetween to form a flow passage that communicates with the front side of the stirring blade in the forward rotation direction, and a part of the object to be stirred during the reverse rotation passes the stirring blade through the flow passage. It is a feature of the stirring method using the stirring device that it flows out to the rear side in the reverse rotation direction.

  Since the stirring device and the stirring method of the present invention have the above-described configuration, it is possible to smoothly mix and paste paste-like materials, powders, and the like with respect to a liquid material when solid shape retention is required. .

FIG. 3 is a schematic view mainly showing a stirring unit with a part of the stirring device omitted. Example 1 It is a top view of a stirring part. Example 1 It is a side view of a stirring part. Example 1 It is a side view which concerns on the modification 1 of a stirring part. Example 1 It is a side view which concerns on the modification 2 of a stirring part. Example 1

  Disperse and mix pastes, powders, etc. for liquids, and smooth mixing when solids are required to retain shape. It was realized by flowing out from the gap for flow through.

  FIG. 1 is a schematic view mainly showing a stirrer with a part of the stirrer omitted, and FIG. 2 is a top view of the stirring unit. In FIG. 1 and FIG. 2, the main part is shown with the stirring unit as the center, and the drive motor for driving the stirring shaft is omitted.

  The outline of the stirring apparatus applied to the present embodiment will be described with reference to FIGS. 1 and 2, and then the structure of the embodiment according to the main part of the present invention will be described.

  As shown in FIG. 1, the stirring device 1 is a device that stirs food, for example, as an object to be stirred, and includes a heating pot 3 as a stirring container and a stirring unit 5.

  The heating pot 3 has a structure in which a cylindrical body portion 7 and a hemispherical bottom portion 9 are integrally formed, and constitutes a stirring container for adding a food material to be stirred and stirring cooking. For example, a jacket may be provided in a closed cross section around the outer surface of the heating pot 3 on the bottom 9 side. Steam is heated and discharged from the outside to the jacket. The bottom portion 9 may be heated by electricity, electromagnetic waves, gas, or the like without providing a jacket. The heating structure can be omitted, and it can be configured as a simple stirring vessel. The heating pot 3 is supported on the base via, for example, legs.

  A lid (not shown) is attached to the upper end of the heating pot 3 so as to be openable and closable.

  The stirring unit 5 includes an outer stirring bar 15 and an inner stirring bar 17 as stirring bars attached to the stirring shaft 13.

  The stirring shaft 13 is inserted into the heating kettle 3 from the upper side and is inclined to be agitated and driven by a driving unit configured by an electric motor and a gear box (not shown) coupled to the upper end outside the heating kettle 3. Yes.

  As shown in FIGS. 1 and 2, the outer stirrer 15 is a so-called circle type formed in an annular shape, and an upper part is attached to the lower part of the stirring shaft 13 and arranged along the bottom part 9 of the heating pot 3. More specifically, the outer stirrer 15 is formed in a substantially annular shape by a round pipe, and the upper part is fixedly attached to the lower part of the stirring shaft 135. The lower part of the outer stirrer 15 is close to the bottom 9 of the heating kettle 3 and is disposed close to the bottom 9 so that the center of curvature of the outer stirrer 15 substantially coincides with the center of curvature of the bottom 9.

  The lower ends 15 a and 15 b of the outer stirrer 15 are spaced apart from each other, the lower end 15 a is disposed close to the rotational axis C of the stirring shaft 15, and the lower end 15 b is slightly separated from the rotational axis C. A temperature sensor 16 is attached to the tip of the lower end 15a so that the temperature on the rotation center side can be detected.

  The lower ends 15a and 15b are joined by an arch-shaped reinforcing portion 18. A first arm portion 21 is attached to the lower end 15a, and a second arm portion 23 is attached to the lower end 15b. The first and second arm portions 21 and 23 are formed in a curved shape so that the first arm portion 21 has no blind spot of the stirring action on the bottom side of the outer stirrer 15.

  A plurality of scraping blades 25 (only one is shown in the figure) are attached to the outer stirrer 15 at a predetermined position at a predetermined interval. The scraping blades 25... Scrape and slide the inner surface of the bottom 9 by the turning rotation of the outer stirrer 15 via the stirring shaft 13.

  Details of the movable support of the stirring blades 25 in the stirring units 5 will be described later.

  The inner stirrer 17 is formed of a round pipe like the outer stirrer 15, and is arranged in a crossed manner inside the outer stirrer 15 so as to be integrally rotatable with the same rotation shaft, and is formed in a long annular shape in the direction of the rotation shaft C Has been. The oval shape of the inner stirring bar 17 is close to an elliptical shape, and the upper part is coupled to the lower end part of the stirring shaft 13 and the lower end is coupled to the reinforcing part 18. The oval shape of the inner stirrer 17 is not limited to an elliptical shape, and various shapes such as a rectangle and a diamond can be selected depending on the purpose of stirring.

  On both sides of the rotating shaft C, a plurality of straight shearing bars 27 and 29 are connected in parallel with each other as a stirring bar connecting the outer stirrer 15 and the inner stirrer 17. Is provided. By this connection, the shearing bars 27 and 29 are configured to extend from both side portions sandwiching the rotation axis of the stirrer to a position offset from the rotation axis in the direction of the rotation axis. However, the stirring bar only needs to be extended from at least one of both sides sandwiching the rotation axis of the stirring bar, and only one of the shearing bars 27 and 29 may be provided. Further, the shape is not limited to a straight shape, and may be formed in a cross-sectional shape having a change such as a wave shape or a thick thin shape in the length direction.

  These shearing bars 27 and 29 are arranged stepwise in the rotational axis direction. Further, the shearing bars 27 and 29 are arranged slightly inclined so that the inner stirrer 17 side is lowered in the direction of the rotation axis C, and the outer stirrer which is higher in the direction of the rotation axis C during forward rotation. When the portion on the 15th side is preceded by rotation, ingredients and the like flow in the direction of the bottom 9 of the heating pot 3, and at the time of reverse rotation, the portion on the inner stirrer 17 side that is the lower side in the direction of the rotation axis C is preceded by rotation. By doing so, it stirs so that a foodstuff etc. may flow to the upper direction of the heating pot 3. FIG.

  The stirrer 5 retains the mechanical strength as a stirring blade due to the coupling with the shearing bars 27 and 29.

  More specifically, the rotating shaft core C of the stirring unit 5 is in the extending direction of the drive shaft of the drive unit (not shown), and is set at an oblique angle with respect to the heating pot 3. It is inclined 20 ° to 40 °, preferably about 30 ° with respect to the vertical axis of the heating pot 3.

  The double ring of the outer stirrer 15 and the inner stirrer 17 is on the extension of the axis of the stirring shaft 13 whose oblique line is the oblique axis, and the crossing angle of the plane including each ring is set. As shown in FIG. 22 as viewed from the upper surface in the direction of the rotation axis C, the crossing angle of the outer stirrer 15 and the inner stirrer 17 is 60 ° to 150 °, preferably about 110 °. The inner stirring bar 17 and the shearing bars 27 and 29 are arranged in an inverted Z shape on the inner diameter side of the outer stirring bar 15 as shown in FIG.

  Although mentioned later, the reinforcement part 18 as a part which has connected the outer stirrer 15 and the inner stirrer 17 is not installed when the adhesion | attachment of a foodstuff, etc. to this site | part becomes a problem. The reinforcing portion 18 is easier to manufacture if it is manufactured.

  The width of the inner stirrer 17 is preferably about 30% or more of the diameter of the hemispherical portion of the bottom 9 of the heating pot 3 (70 to 20%). The shearing bars 27 and 29 are the center of the stirring function, and the inner stirring bar 17 can be partially or entirely omitted.

  The shearing bars 27 and 29 and the rotating shaft core C are spatially twisted by the arrangement and coupling structure as described above, but the shearing bars 27 and 29 with respect to the plane orthogonal to the rotating shaft core C are arranged. The mutual angle is slightly acute or obtuse.

  Since the outer stirrer 15 and the inner stirrer 17 are connected by the shearing bars 27 and 29 at appropriate intervals, this angle changes from an acute angle (upper side) to an obtuse angle (lower side). Compared with the case where the angle is a right angle, the range of motion (movement) of the shearing bars 27 and 29 is widened, and the mixing effect is slightly increased, which is preferable.

  That is, when there is a shearing bar on the surface orthogonal to the rotation axis C, the rotation locus is on the orthogonal row. On the other hand, in the case of having an angle with respect to the orthogonal plane, the rotation locus becomes the side surface of the truncated cone and spreads in the axial direction, contributing to mixing in the axial direction.

[Stirring part]
FIG. 3 is a side view of the stirring unit according to the main part of the embodiment of the present invention.

  As shown in FIGS. 1 and 3, the plurality of scraping blades 25 supported by the outer stirrer 15 of the stirring unit 5 have the same structure and a pair of brackets 31a fixed to the outer stirrer 15. A pair of first and second pins 33 and 35 are opposedly supported at a predetermined interval between 31b. In the scraping blade 25, blade pieces 25a, 25b, 25c, 25d, and 25e are provided between the brackets 31a and 31b to constitute the scraping blade 25 as a whole. The tip of the scraping blade 25 is curved so as to be in contact with the spherical surface of the bottom inner surface 9a of the heating pot 3 as shown in FIG. For this reason, strictly speaking, the shape of each blade piece 25a, 25b, 25c, 25d, 25e is different. However, in the following description, the single blade piece 25a is represented, and the same portion other than the curved shape of the tip is described.

  The blade piece 25a has a base portion 37 and a blade portion 39 provided integrally. The base 37 is held between the first pin 33 and the second pin 35. The base 37 is provided with a first fitting recess 41 having a slightly larger or substantially the same curvature with respect to the radius of the cross section of the first pin 33 at one end. When the first fitting recess 41 is fitted to the first pin 33, the scraping blade 25 can swing and rotate around the first pin 33.

  At the other end of the base portion 37, a second loose fitting recess 43 is provided with a curvature larger than the radius of the cross section of the second pin 35. As the second loose fitting recess 43 is loosely fitted to the second pin 35, the scraping blade 25 is restricted from rotating beyond a certain range.

  The tip 39a of each blade portion 39 constitutes the tip of the stirring blade 25, is formed at an acute angle in cross section, and a tip surface 39b is inclined adjacent to the tip 39a. When the tip 39a contacts the bottom inner surface 9a of the heating pot 3, the tip surface 39b forms a clearance gap with the inner surface 3 of the heating pot 3 due to the inclination. When the scraping blade 25 swings during reverse rotation and reaches the position shown in the chain line, the tip surface 39a faces the bottom inner surface 9a of the heating pot 3 to form a flow gap OP therebetween.

  That is, when the stirring shaft 15 rotates in the forward direction, the forward direction front surface 25aa of the stirring blades 25 ... receives flow resistance from the object to be stirred and is pressed against the inner surface of the heating pot 3, so that the stirring blades 25 ... The tip 39a of the blade 39, which is the tip of the stirring blade 25, contacts the bottom inner surface 9a of the heating kettle 3 so as to scrape and slide at an acute angle with respect to the inner surface of the heating kettle 3.

  Here, the stirring blades 25... Scrape and slide at an acute angle with respect to the inner surface of the heating pot 3 because the angle between the surface 25ab opposite to the traveling direction of the blades and the wall inner surface 9a. It means sliding at an acute angle.

  The agitation blades 25... Have a rotation margin that allows the tip 39a to move to the outer peripheral side with respect to the inner surface of the heating pot 3, so that the tip 39a can be reliably pressed.

  When the outer stirrer 15 is reversed, the front surface 25ab in the reverse direction (rear surface of the stirring blade) of the stirring blade 25 receives flow resistance from the object to be stirred, so that the stirring blade 25 is separated from the inner surface of the heating pot 3. Rotate in the direction (counter-pressing direction). This rotation is allowed by the relative rotation of the first fitting recess 41 along the first pin 33.

  The relative rotation at the time of reverse rotation stops when the second loose fitting recess 43 engages with the second pin 35.

  At this time, the tips 39a of the stirring blades 25 ... are separated from the bottom inner surface 9a of the heating kettle 3 while the stirring blades 25 ... form an acute angle with the bottom inner surface 9a of the heating kettle 3, A flow gap OP is formed between the tips 39b of the blades 25 and the bottom inner surface 9a of the heating pot 3.

  Here, the stirrer blades 25... Remain at an acute angle with respect to the bottom inner surface 9a of the heating pot 3 at the time of reverse rotation, because the surface 25ab in the traveling direction of the blades 25. It means that the angle between them remains an acute angle.

  The size of the flow gap OP formed between the inner surface 9a of the bottom portion of the heating pot 3 is preferably about 10 mm in order to eliminate lumps. However, the size of the flow gap OP can be appropriately enlarged or reduced depending on the nature of the fluid food.

  The portion that determines the size of the flow gap OP may be either the tip 39a of the blade 39 or the tip surface 39b of the blade 39. In this embodiment, when the flow gap OP is formed, the rear end 39c of the blade 39 has a rear end 39c with respect to the bottom inner surface 9a of the heating pot 3 rather than the front 39a. It is set to be slightly far away.

  Therefore, the portion that determines the size of the flow gap OP is the tip 39a of the blade 39, and the tip surface 39b is inclined so as to gradually move away from the bottom inner surface 9a in the reverse rotation direction. .

  However, the front end 39a... And the rear end 39c... Can be set to be substantially the same distance from the bottom inner surface 9a of the heating pot 3, and the front end 39a. It can also set so that it may become slightly far from the bottom inner surface 9a of the heating pot 3.

  When the flow gap OP is formed, the cross-sectional area gradually decreases in the forward rotation direction between the front surface 25ab in the reverse direction of the stirring blades 25 ... and the bottom inner surface 9a of the heating pot 3, and communicates with the flow gap OP. A substantially wedge-shaped passage PA is formed. The passage PA is not necessarily limited to a wedge shape as long as the cross-sectional area gradually decreases in the forward rotation direction, and the surface on the blade portion 39 side may be convex or concave.

  By forming the passage PA and the flow gap OP, the cross-sectional area gradually decreases in the forward rotation direction at the time of reverse rotation to form a flow passage communicating with the forward direction front side 25aa ... side of the stirring blade 25 ... The flow rate of the food that flows through the flow gap OP during the reverse rotation can be relatively increased with respect to the food that flows in the normal rotation direction only by the inertial force during the normal rotation.

[Modification 1]
FIG. 4 is a side view according to a modified example of the stirring unit.

  In this modification, as shown in FIG. 4, in addition to the first and second pins 33 and 35, a stopper pin 45 is provided between the brackets 31a and 31b as a stopper. An escape recess 47 is provided at the other end of the base 37 in place of the second loose fitting recess 43. Since the escape recess 47 faces the second pin 35, the scraping blade 25 is allowed to swing in the direction of the chain line during reverse rotation. Swinging of the scraping blade 25 beyond a certain range is restricted by contact with the stopper pin 45.

  Thus, also in this modification, the passage PA and the flow gap OP are formed during the reverse rotation.

  In Modification 1, the stopper pin has a different diameter between the support hole portion and the stopper portion, and the flow gap OP can be changed by changing the diameter of the stopper portion.

[Modification 2]
FIG. 5 is a side view according to a modified example of the stirring unit.

  In this modified example, as shown in FIG. 5, the position of the stopper pin 45 provided in addition to the first and second pins 33 and 35 can be changed, and in contact with the stirring blade 25 during reverse rotation, And an adjustment portion for adjusting the flow gap OP.

  As a structure of the adjusting portion, a support hole 49 for changing the pin attachment position is added to the brackets 31a and 31b. The change is made by removing the stopper pin 45 by screwing or the like from the original support hole in the hatched position and replacing it with the support hole 49 and fixing by screwing or the like. By this replacement, the swinging range of the stirring blades 25... Can be expanded during reverse rotation, the flow gap OP can be expanded, and the wedge characteristics of the passage PA can be changed. The stopper pin 45 can be returned to the original support hole and fixed.

[Stirring function]
The problem was improved and solved by repeating the forward rotation and reverse rotation of the stirring device 1 at an appropriate frequency. The stirring / mixing mechanism when the machine is rotated will be described.

  It is a stirring and mixing operation in a normal stirring tank that a fluid is put into the heating pot 3 (stirring tank) and the stirring apparatus 1 is rotated at a constant speed. In this case, the fluid in the tank swirls in the same direction as the rotation of the stirring unit 5. The relative speed between the stirring unit 5 and the swirling fluid is considerably smaller than the relative speed between the stirring blade and the inner wall (tank wall) of the heating pot 3 and between the stirring blade and the stationary fluid. The mixing of the fluid in the tank is mainly performed by the disturbance due to the scraping blade 25 moving in the swirling fluid and the disturbance of the flow that the swirling fluid receives from the tank wall or the like.

  When the agitator 1 is stopped once and then reversely rotated, the reverse rotation effect normally expected (an increase in the effect of adding the mixing effect when the liquid flow is in the opposite direction to the normal mixing effect) is exceeded. An increase in mixing force occurs.

  At the time of switching from forward rotation to reverse rotation, the material flow direction and the moving direction of the stirring blade 25 are switched from the same direction to the opposite direction, and the relative speed of the swirling fluid and the stirring blade 25... The relative speed is several times higher. For example, when the speed of the stirring blade is u and the speed of the swirling fluid is 0.7u, the relative speed 0.3u changes to 1.7u (5.7 times).

  Changing the rotation direction gives a strong mixing effect to the material, gives stirring strength that cannot be obtained in a certain direction, and enables more uniform dispersion by dispersing the powder in the liquid.

  Furthermore, since the material flow direction changes greatly, mixing is accelerated and the mixing time is greatly shortened.

These effects solve and improve the problem. That is,
(1) Insufficient dispersion of paste with less fluidity (= remaining paste) was solved and improved by a significant increase in mixing force due to collision between the flow inertia of the liquid during reverse rotation and the rotational motion of the blades.

  (2) In response to the problem that the paste-like material and the powder remain in the part where the relative motion with the liquid to be stirred is small in the stirring blade 25, when the stirring device 1 is stopped once and then reversely rotated, the flow direction of the material and the blade The direction of motion of the agitator is reversed, and the rear surface of the stirring blades 25.

Due to this effect, deposits (for example, adhered paste and powder) resulting from a small relative motion between the blade surface and the material are detached from the blade surface due to a change in the relative motion. The removed material is mixed and stirred in the tank. (As a result of reverse rotation, parts with weak relative motion, such as the back of the blade, were improved and eliminated.)
(3) When the powder is dispersed in the liquid, the problem that the dispersion is not sufficient and lumps can be improved by increasing the mixing force by reverse rotation.

  (4) The problem of insufficient mixing due to the poorly flowable food material being mixed together with the stirring unit 5 was solved and improved when the rotation was reversed.

  (5) By setting an appropriate stop period between forward rotation and reverse rotation, it is possible to suppress the damage to the solid material due to the rotation switching and increase the mixing force.

  Furthermore, in addition to the above effects, there are effects unique to the present stirring device 1.

  As described above, the scraping blade 25 ... slides in contact with the tank wall at an acute angle during normal rotation, and exerts an effect of scraping the bottom inner surface 9a by pressing against the bottom inner surface 9a with a reaction force pushing food. To do. At the time of reverse rotation, the motion relationship between the stirring blades 25... And the liquid is reversed, the direction of the force with which the liquid pushes the stirring blades 25 is reversed, and the stirring blades 25 are separated from the bottom inner surface 9a. .

  The point is to restrict the movable range of the stirring blades 25... So that the distance between the stirring blades 25.

  In this way, when reversed, the passage PA and the flow gap OP are formed as described above between the scraping blades 25... And the bottom inner surface 9a having a predetermined interval (clearance). Can flow.

  The passage PA formed by the scraping blades 25 at the time of reverse rotation has a substantially wedge-shaped cross section, and the distance from the bottom inner surface 9a gradually decreases in the normal rotation direction. The circumferential dimension of the stirring blades 25... Is set to about 10-15% of the diameter of the heating pot 3, and when the stirring blades 25. Due to the wedge shape, the scraping blade 25... Acts to push the food into the flow gap OP at the tip.

  For this reason, the flow velocity of the liquid flowing from the passage PA toward the flow gap OP and flowing out in the forward rotation direction is considerably higher than the peripheral speed during the forward rotation of the stirring blade 25. It is a few times faster. The rotational speed, the shape of the scraping blade (length, angle), the opening area of the flow gap OP, and the passage so that the flow velocity is in the range of about 0.5 m / s to 20 m / s and the flow velocity is appropriate for mixing. By setting the wedge shape of PA, it is possible to eliminate lumps and mix strength.

  Further, at the time of reverse rotation, vortices may be generated on the back surface in the reverse direction of the stirring blades 25, that is, the front surface 25aa in the normal rotation direction at the time of normal rotation.

  That is, when the reversal is performed in this way, large particles such as lumps are ground according to the set opening area, wedge shape and rotational speed when flowing out of the flow gap OP through the passage PA. As a result, the effect of eliminating so-called lumps can be obtained. In the case of eliminating general lumps, the gap between the tip 39a and the bottom inner surface 9a should be set to about 10 mm with respect to a width dimension of 200 to 250 mm between the brackets 31a and 31b to which the stirring blades 25 are attached. .

  By changing the position of the stopper pin 45 by the structure of the modified example 2, an optimal grinding action can be given.

  In the structure of the first modification, the second pin 35 can be exchanged by fixing the brackets 31a and 31b with screws or the like, and the setting of the passage PA and the flow gap OP can be changed by changing the thickness of the stopper portion. .

  Furthermore, as another effect, since the liquid is made to flow at a high flow rate from the flow gap OP in the immediate vicinity of the bottom inner surface 9a of the heating pot 3, which is a heat transfer surface, there is a feature that a high heat transfer coefficient can be obtained. The heat transfer coefficient of the inner boundary film, which is the heat transfer coefficient on the bottom inner surface 9a, is proportional to about 0.8 power of the heat transfer surface flow velocity.

  Further, due to the reverse rotation, the scraping blades 25 ... are separated from the bottom inner surface 9a, and the effect is that the liquid flows through the passage PA between the bottom inner surface 9a and the scraping blades 25, and the flow gap OP. The material flows at a high flow velocity in the vicinity of the back surface 25 (reverse direction front surface 25ab). At the time of forward rotation, there is almost no material flow on the back surface of the stirring blade 25, and powder or the like tends to adhere, but the adhering matter is removed as described above at the time of reverse rotation.

[Others]
The flow path of the stirring method of the present invention is not limited to the one formed by the passage PA and the flow gap OP, and the form in which the tip of the stirring blade is in direct contact with the bottom inner surface 9a of the heating kettle 3 in both forward and reverse rotations. Including. In this case, an opening may be partially formed at the tip of the stirring blade, and a flow path may be formed by this opening and a wedge-shaped passage between the front surface and the bottom inner surface of the stirring blade in the reverse rotation direction.

  The opening can be set in various types, and the tip of the stirring blade can be comb-shaped, and the opening can be formed between the comb-shaped shape and the bottom inner surface.

  The opening may be an open / close structure, and may be configured to close during normal rotation and open during reverse rotation due to resistance from the liquid.

  The stirring blade may have a flexible structure in the rotational direction, and a flow gap may be formed between the tip of the stirring blade and the inner surface of the bottom during reverse rotation.

  The stirring blade 25 can also be configured by integrating the blade pieces 25a, 25b, 25c, 25d, and 25e.

  It is also possible to support only a part of the blade pieces 25a, 25b, 25c, 25d, 25e so as to be able to swing, and to form a flow gap OP between the part of the blade pieces and the bottom inner surface 9a.

  Various forms of the stirring unit 5 of the stirrer 1 can be applied, and the stirrer is not limited to an annular circle type, and is also applied to a so-called anchor type (Japanese Patent Laid-Open No. 2000-157855) having an arc stirrer. be able to.

  The agitated material to be agitated is not limited to foods but can be applied to drugs, building materials, and the like that require agitation.

1 Stirrer 3 Heating kettle (stirring container)
DESCRIPTION OF SYMBOLS 5 Stirring part 7 trunk | drum 9 bottom part 9a inner surface of bottom part 13 stirring shaft 15 outer stirrer (stirrer)
25 Stirring blade 39a Tip of blade (tip of stirring blade)
45 Stopper pin (stopper, adjustment part)
49 Support hole (adjustment part)
OP Flow gap (flow passage)
PA passage (flow passage)

Claims (5)

A stirring vessel that contains a fluid to-be-stirred object or contains a fluid to-be-stirred object, a stirring unit that movably supports a stirring blade that stirs and moves along the inner surface of the stirring vessel, and the stirring unit. A stirring device that includes a stirring shaft that supports and can be driven to switch between normal rotation and reverse rotation with respect to the stirring vessel,
The stirring blade has a base at one end and a tip in contact with the inner surface of the stirring container at the other end,
The movable support of the stirring blade is a support capable of swinging in the forward and reverse directions by holding the base ,
The tip of the stirring blade is in contact with the inner surface of the stirring vessel so that the stirring blade receives flow resistance from the object to be stirred during the forward rotation and scrapes and slides at an acute angle with respect to the inner surface of the stirring vessel. ,
During the reverse rotation, the stirring blade receives flow resistance from the object to be stirred and forms an acute angle with respect to the inner surface of the stirring vessel, and the tip of the stirring blade is separated from the inner surface of the stirring vessel and the tip of the stirring blade and the A flow passage is formed between the inner surface of the stirring vessel and a flow gap between the front surface of the stirring blade in the reverse direction and the inner surface of the stirring vessel. With a configuration to form and maintain,
In the configuration in which the passage is formed and maintained, the loose fitting recess of the stirring blade that stops the separation by engagement and the pin of the stirring portion, or the swing of the stirring blade over a certain range is regulated by contact. A stopper for the agitation unit ,
Causing the part to be stirred to flow out of the flow gap through the passage during the reverse rotation;
A stirrer characterized by that. The stirring device according to claim 1,
The stirring vessel has a hemispherical bottom and a cylindrical cylinder.
The agitation shaft is inserted into the agitation container from above and is inclined and arranged,
The stirrer is formed in an annular shape or an arc shape, and an upper portion is attached to a lower portion of the stirring shaft and disposed along the bottom portion.
A stirrer characterized by that. The stirring device according to claim 1 or 2,
The movable support of the stirring blade with respect to the stirrer includes an adjusting portion for adjusting the flow gap.
A stirrer characterized by that. The stirring device according to claim 3,
The adjusting portion is a stopper that is capable of setting and changing the position of the swinging blade in the reverse rotation direction by contacting the stirring blade during the reverse rotation.
A stirrer characterized by that. A stirrer container that contains a fluid stirrer or contains a fluid stirrer, a stirrer that supports a stirrer that stirs and moves along the inner surface of the stirrer, and supports the stirrer A stirring method using a stirring device having a stirring shaft that can be driven to switch between normal rotation and reverse rotation with respect to the stirring container,
The stirring blade has a base at one end and a tip in contact with the inner surface of the stirring container at the other end,
The support of the stirring blade is a support capable of swinging in the forward and reverse directions by holding the base,
During the reverse rotation, a cross-sectional area gradually decreases in the forward rotation direction between the front surface in the reverse rotation direction of the stirring blade and the inner surface of the stirring vessel to form and maintain a flow passage communicating with the front side in the forward rotation direction of the stirring blade. ,
A part of the object to be stirred at the time of the reverse rotation is caused to flow out to the rear side in the reverse direction of the stirring blade through a flow path maintained at the time of the reverse rotation;
A stirring method using a stirring device.

Images